Introduction to Statistical Reasoning
Instructor: Ivo Dinov, Asst. Prof.
Departments of Statistics & Neurology
Friday, Oct. 26, 2001, turn in after lecture
submission rules. On the front page include the following
(HW_4_1) Define the following terms and answer the questions regarding
Can an estimator be unbiased, but imprecise? For the following data what
is an unbiased estimator of the population average? Compute the coresponding
[sample mean] and its precision [StdError(sample
(HW_4_2) Compute the correlation coefficient, R(X,Y),
for the following data. Please do this by hand and show all of your work.
(HW_4_3) Find the equiation of the line, l1, passing through
the points (-3, 5) and (X=1, Y=2). Identify the slope, m1,
and Y-intercept, b1, of the line. A line, l2,
to l1 if its slope is -1/m1.
Can you find the
equation of the line, l2, perpendicular to l1,
which goes through
the point (X=0, Y=3). What are l2's slope, m2, and
\Ivo D. Dinov, Ph.D., Departments of Statistics and Neurology, UCLA
School of Medicine/